2009 Ford F350-F550 Super Duty Series "Diesel Only" 40 gallon rear/aft axle truck tank. This tank replaces the 6 Bolt style sending unit . not the lock ring style. Each tank includes a specifically designed sending unit gasket(4740A-OR) . 6 new bolts with a tube of thread sealer and a sending unit hold down ring. When installing the sending unit . coat each screw with the thread sealant. Do  NOT  use the OEM sending unit gasket. This tank does  NOT  include a sending unit . an EMS valve or an EMS valve gasket. The material used to make this fuel tank (High Density . Cross-linking Polyethylene- XLPE) allows it to be used with ALL types/grades of diesel fuel including Bio-Diesel.